package main

import "fmt"

func reverseLeftWords(s string, n int) string {
	l := len(s)
	if n >= l {
		return s
	}
	return s[n:l] + s[0:n]
}

func main() {
	s := "12345"
	s1 := reverseLeftWords(s, 2)
	fmt.Println(s1)
}
